2D Semiconducting Metal–Organic Framework Thin Films for Organic Spin Valves

Abstract

2D conductive metal–organic frameworks (2D c‐MOFs) feature promising applications as chemiresistive sensors, electrode materials, electrocatalysts, and electronic devices. However, exploration of the spin‐polarized transport in this emerging materials and development of the relevant spintronics have not yet been implemented. In this work, layer‐by‐layer assembly was applied to fabricate highly crystalline and oriented thin films of a 2D c‐MOF, Cu3(HHTP)2, (HHTP: 2,3,6,7,10,11‐hexahydroxytriphenylene), with tunable thicknesses on the La0.67Sr0.33MnO3 (LSMO) ferromagnetic electrode. The magnetoresistance (MR) of the LSMO/Cu3(HHTP)2/Co organic spin valves (OSVs) reaches up to 25 % at 10 K. The MR can be retained with good film thickness adaptability varied from 30 to 100 nm and also at high temperatures (up to 200 K). This work demonstrates the first potential applications of 2D c‐MOFs in spintronics.

Electrochemical deposition and thermoelectric characterisation of a semiconducting 2-D metal–organic framework thin film

“…has focussed on chemiresistive sensing and energy storage applications. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] (Table SI1) (Table S2). [34][35][36] These values are comparable to other classes of thermoelectric materials such as nanostructured materials (Bi2S3 nanowires 37 ), metal oxides (Ca0.8Dy0.2MnO3 38 ) and conducting polymers (poly(3,4-ethylenedioxythiophene):polystyrenesulfonate/polypyrrole/paper 39 ).…”

Electrochemical Synthesis of Large Area Two‐Dimensional Metal–Organic Framework Films on Copper Anodes

“…TEM is used to examine the microstructure of Cu 3 (HHTP) 2 MOF film. It shows that the average size of the crystalline domain is nearly 80 nm (Supporting Information, Figure S20a), which is significantly higher than that of Cu 3 (HHTP) 2 MOF films prepared by other methods (Supporting Information, Figures S20b, 20c) [36, 37] . The TEM image shows an obvious crystal lattice with a lamellar structure (Figure 2 c), and the corresponding selected area electron diffraction (SAED) pattern reveals a hexagonal lattice structure that can be attributed to the hexagonal symmetry of the (100) zone plane lattice (inset in Figure 2 c).…”

Metal–Organic Framework Thin Films: Fabrication, Modification, and Patterning

“…Nowadays, MOFs are available in various structures, such as nanocrystals (NCs) [27], nanospheres [28], nanosheets [29], needles [30], hierarchical monoliths [31], thin films (TFs) [32], membranes [33], and glasses [34][35][36]. Among these structures, MOF-TFs are drawing increasing attention due to their tremendous potential in the development of nanotechnology-enabling applications, such as optics [37], photonics [38], electronics [39], catalytic coatings [40], sensing [41][42][43][44], solar cell [45], battery [46], and supercapacitor [44]. One thing to notice is that MOF-TFs cannot be differentiated from MOF membranes by their chemical composition or by their selection of substrates.…”